Telegraphy



L. I M. POTTS Jan. 16,1945.

TELEGRAPH! 4'Sheeis-Sheet 1 Original Filed May 9, 1940 INVENTOR LOUIS M.POTTS AT TOR NEY- Jam. 16, 1945. M. POTTS Re 22592 TELEGRAPHY OriginalFiled May-9, 1940 4 Sheets-Shet 2 INVENTOR LOUIS M. POTTS ATTORNEY Jmls, 1945. L. M, gw Re 22,592

' v TELEGRAPH! I Original Filed May 9, 1940- 4 Sheets-Sheet a INVENTORLOUIS M. 'PQTTS ATTORNEY L. M, POTTS Jan. 16,1945.

TELEGRAPHY Original Filed May 9, 1940 4 Sheets-Sheet 4 FIG. I?!

FIG. II

M SmOFw an H w. m cm W OPEIm v 5 53 a v 2 o b\ 0 "HM; Q F 3 a 0 ow. a sm 2 3 %2 2 am 22 m 8 77 v w RECEIVING STATION 1 Y INVENTOR LOUIS M,POTTS ATTORNEY Reissued Jan. 16, 1945 TELEGRAPHY Louis M. Potts,Evanston, 111., assignor to Teletype Corporation, Chicago, Ill., acorporation of Delaware Original No. 2,339,292, dated January 18, 1944,

Serial No. 415,694, October 20, 1941, which is a division of Serial No.334,108, May 9, 1940. Application for reissue September 18, 1944, Serial9 Claims. (C1- 1.7817) The present invention relates to printingtelegraph apparatus and more particularly to cyclically phased typewheel printers having a plurality of printing positions.

The principal object of the present invention resides in the provisionof printing and selecting apparatus designed to enlarge the range ofselective possibilities in start-stop telegraph systems withoutextensive modification of the fundamental practices in printingtelegraph selecting apparatus and without increasing the number ofcomponent impulses from that of conventional signals. This applicationis a division of copending application Serial No. 334,108, filed May 9,1940', now Patent No. 2,323,932.

The use of a plurality of case shift signals in controlling theoperation of telegraph printing apparatus is generally known butcertainnovel aspects herewith introduced have to do with a conversion systemfor adapting existent practices in design and manufacture of type wheelprinters to the use of a greater number of case shift control functions.As an incident to this practice, there is contemplated under oneembodiment the utilization of a six-unit code for the supervision ofapparatus constituted essentially of a five-unit selection and controlmechanism, the presence or absence of the sixth impulse being adetermining factor in establishing a secondary case shift control whilethe conventional pair of case shift signals are utilized additionally tothe said sixth impulse case shift control for performing the primarycase shift supervision. As a result, four in.-

stead of only two case shift conditions are pro vided, and these withbut minimum modification in the essential design of a type wheelprinter, such as thatdisclosed in-copending application Serial No.193,642, filed March 3, 1938.

Ina type wheel printer of the design herein contemplated, the type wheelcarrying shaft is a frictionally driven member surrounded by a number ofparallelly disposed selector pins. A shaft stop arm engages one of thesepins when any of the latter is brought into selective conditionestablished by an individual disposition of five selector discs, eachprovided with peripherally dis-" posed notch and lug attributes, and theseveral adapted to be moved in response to the selective operation of aline signal supervised transfer mechanism. In addition to carrying thetype wheel andacco-rdingly positioningthe latter angularly so as topresent predetermined type faces into printing position, the type wheelcarrying shaft is also utilized for supporting and rotating with itdivers incidental function performing interponent elements. When certainone or ones of said elements are arrested in predetermined angularpositions as controlled by the type wheel shaft arresting apparatus,there are conditioned corresponding one or ones of several functionperforming levers for executing miscellaneous incidental operations;viz., primary case shift, carriage return, etc.

An additional set of case shift control functions identified assecondaryto the conventional case shift operation is contemplated suchthat their incorporation into existing apparatus'may permit of anenlargement of several selective possibilities to an extent of doublingthe available selective possibilities based on previous practice.-

In a modified practice of the instant invention a system of responsiverelay elements is'made to final impulse of a preceding signal. In thisway 7 the nature of the final impulse of a signal may be varied andthereby enter into the code combi-' nation of its associated signal as apermutation component. Also this impulse serves as a stop impulse nomatter what its electrical nature happens to be and thu the need for aseparate stop impulse is obviated.

For a more comprehensive understanding of the present invention,reference may be had to the accompanying drawings and to the detailedspecification following hereinafter in which siniilar referencecharacters indicate corresponding parts throughout, and in which:

Fig. 1 is a vertical sectional view throu h aprinting telegraphapparatus, such as that featured in the co'pending applicatio'nmentionedabove, having incorporated therein the improve-' ments which exemplifyone embodiment of the instant invention;

' Fig. 2 is a plan sectional view taken approxinegative currentcharacteristics for the purpose of obtaining a'shift control index; 7

' Fig. 10 illustrates a modified form of shift mechanism especiallyadapted for use in a system such asthatfeatured in Fig. 9;

Fig. 11 is a fragmentary plan section of a second modificationapparatus;

Fig. 12 is a schematic diagram of a system which uses an apparatus ofthe type shown in Fig.

11 in which-the signals are of conventional'length',

but in which-a sixth impulse is incorporated with the stop interval andthe start impulse is varied to contrast with the stop impulse; and

Fig. 13 is a diagrammatic chart of a code..sig.-.

nal such as may be used in the system disclosed in Figs. 11 and 12showingvhoW-its component.

parts are functionallyallocated.

In illustrating the preferred embodiment of the present invention, Figs.1 to 4,-a typewheel page.-

printing machine is used whose selector shaft is.

maintained in a .vertical position,- and'at, whose upper extremity iscarried a cylindrical type supporting wheel having individually movableprinting pallets. This type wheel indicated I I. is pro.-

vided with four annular rows of type pallets I2,

each pallet. ofi twhichflisradially slidable within. its own; confininggroove, andea'ch annular rowoftwhich is retained and. urged towardsthe.concentriccenter'of the'wheel'by agarter spring I.3.-,

A- cylindricaltprinting platen I 4 iszjournaled uponasupportingxshaftilfi and is shiftable endwise step-:by-step in. onedirection; in .response'to, printmg operations, and totally in: theother direction:

in response to a carriage return signal in.. 3.1113117.

ner: well-known among page printing-machines.

the-periphery" otplaten I4, is indicative :of the printing 1100115:-and; accordingly; denotes; the level at. which eachrow; ofprintingpallets must; be

aligned inorder: to present: it. into: printing en-.- gagement with saidplaten. It:

The-type-swheel H is integrallyassociatedwithv ausupporti'ng collar 22-;and is, splined to rotate. with thetypewheel; shaft; 23 butfree tobe-shifted longitudinally thereof together with its. collar 22.Thislongitudina-l shifting of type-wheel II i exe:-. outed throughengagement of -a shifting frame 24* whose: horizontalbar. 25 is slottedas at. 2.6.; Fig; 2," to straddle and b'e received within the groove; 21of collar 22. For DUIDOSESiOf steadying'the shifting: framefl; itsobar25 is provided at remote endsvwithxyokes 23;:Fig. 2;, ofwhichoneisvisible' in Fig.1 2, and. which; is; indicated thereat. straddlin-g thensupportingcolumn29', parts: 28. and 29 being duplicatedat;the opposite end of: bar 25', but being brokenzawayiin. thfi'limltd.disclosure of Fig.2

Collar: 22, Figs. 1 is. prevented from rota-ting;withzrespect,.to.shaft:l3 by the interenga ement; between;--:its slideen agement coupling; bar. 31; wi h thati'3210faselector arm, sleeve3:3... Because: of the tongue and groove en agement; between arms: 3I'and-32, type wheel; II, together with its collar 22, may beshiftediongitudinally; without disengagement of drivingconnectionbetween said elements.- M. and "32, but. permitting, nevertheless.v

of: axial shifting. of the; type wheeland its associated"elementsthroughout a. distance: sufficient, tmelevate th -type wheel-tothe dottedoutline position. of-Fig.1 1), whilestill. maintaining;thedrlving'gand -.'driven-.relationship, between the-Y Se-v' lector armsleevee33andthetypawheelI I Sleevev 33. 1 and integrally associatedselector maria-3.4 are 'bound-yto. the shaft. 23. so asxtorrotate;

wit it under lmpetusor thedriven;geanwheel 35 which maintains meshingengagement with the motor driving worm 36, but because selector arm 34may be obstructed by oneor another of the plurality of selectable pins31, the assembly, 'including shaft 23, may thereby be arrested at anyoneof several radial positions correspondin with the several selectablepins 31. In passing, mention is made of the scant showing of a selectorpin. assembly in Fig. 1. Actually this apparatus consists of possiblythirty-two pins 31 all similarly the adjacent surfaces of gear wheel 35and said= discs. 38 and 38. As explained in' greater detail, in theabovereferred to copending application, the rotary drum selector Whichincludes; the above-mentioned selectable, pins 37 is designed to,accommodatea five-unit code having; as its essential selectorapparatusfiw circular discs 42 whose peripheries are provided-with anotchand. I

iug;.di.str.ibution. so that; upon each permutative placement. of theseveral. discs :4 2- I an. individual clearance is afforded. to .oneof:'said several. sc

2 lectable pins 31 which. whenthat occurs, moves inwardly-to, presentitsupper extremity, Fig; 1, into. the; path of. rotatable armv 34-,blocking the further progress of said arm and through itthe rotation ofshaft '23..

This selection, arresting shaft 23 in any of thirty-two rotarypositions, may not only serve toalign a=corresponding printing lug I2for subsequent printing operation, but also, because; shaft 23. is acarrier of other selecting-apparatus, it may serve to condition specialfunction operat-- ingmembers as more fully described in said copending.application. Of these special functions,

. certain ones only are'concernedin the instant disclosure, and these.will. be identified; asv the two primary case 'shift functions; namely,the conventional upper and lower case shifts.- In Fig. 1, the twoselectablebars which execute thesecase shift. functions are illustratedin the lower portion of the figure-thy the reference numerals-- 4.3-and-44, the. former having a sidewardly ex tending lug. 45, andthe-latter a similar. lug de-. noted 46.

The apparatus now described is that which, in

response tothetwo conventional case shift signals, exercises apartsupervision in determining the extent of vertical shifting of the typewheel-.-

, present one or another of-the lugs:4.5 and 4E forwardly.. Whenbar. 43is thusselected and its lug.

45 moves forwardly, there follows towards the conclusion of itsselection cycle a rightward movement. of alLof the. bars,.including .43.and.

so; that. lug, .45., being. theonlyone in extended 7 position, is made.to engage the. lowermost eX-- tremity 41. of a. shifting-lever 48. whoseopposite end, being. provided. with the.- open. slot... 49. and

The single straddling the stud pin of case shift plate 52 causes thelatter to be moved leftwardly or into the position illustrated inFig. 1. The immediate significance of this movement is its characteristic placement horizontally of the anchor pivot 53, see also Figs. 3and 4, but a further consequence of this operation will be discussedlater.

Alternatively, upon the selection of the other shift bar 44 and theconsequent movement of its lug 46 into the path of the lowermostextremity 54 of lever 55, there results the movement of case shift plate52 rightwardly to an extent of movement as denoted by the elongated hole55 and the consequent restoration of case shift lever to its firstposition, since the two levers 48 and are articulated to the commonpivot shaft 5?, each serving to restore the other upon its selec tion.The result of the operation of lever 55 sofar as the specificcontemplation is concerned is in the movement of said pivot stud 53rightwardly for a. purpose to be discussed later.

Pivot screw 53, which has already been introduced above, constitutes acritical center and pivot support for an important element in the shiftmechanism; namely, bell crank H3!l62, about which more will be saidlater. Moreover, this key pivot is anchored in a sidewardly extendingshelf I04, Figs. 3 and 4, which is integral with the shift plate 52whose progress from side to side is governed by the selectable leversii-l and 44 as just described. When either of its alternative positionsis established, shift plate 52 is thereat detained by the action of aspring loaded detent lever 50 which is pivoted to the plate 52 at so asto urge with its V-shapecl extremity against one side or the other of afixed rod 16). When moved to its opposite position from either, lever 50is cammed about pivot Ell through cooperation of its V-shaped nose andsaid rod "It;

Referring now again to the vertical shifting fram 24 which carries withit the type wheel I I,

it will be noted that its side wall, Fig. 1, contains an irregularaperture 58 whose lower edge provides two shoulders or steps indicated59 and iii seen also in Figs. 5 to 8. The movement of frame 24 ismaintained in a parallel vertical direction not alone by theaforedescribecl algnment studs 29 but also because of shaft 51, one endof which is rigidly anchored in the framework and the surrounding rollersleeve carried by said shaft fits closely within the confining slot 52of framework 24. The frame 24 is lifted by means of an integral ear 63to Which is connected a comparatively stout but nevertheless yieldablelift spring 64, having an upper loop which is suspended from the hookedextremity 65 of a lifting lever 65 pivoted at 61 in a stationary portionof the printer structure.

Lever 66 is of the third class type since the lifting force is appliedthereto at an intermediate point in its length by means of a roller 68which is carried at the end of one arm 59 of a bell crank lever whoseother arm H, having an integrally associated bracket I2, carries tworollers 13 and I4. Of these, roller 13 is actuated by the periphery ofan initially effective operating cam 25 carried upon the auxiliary shaft16 while roller i4 is confined within the trackway of a side channel cam11, the two cams functioning jointly in a manner fully described in saidcopending application.

Auxiliary shaft 16 and the principal control shaft 18 receive theirpower from drive worm 36, which is carried by the motor shaft, through agear train which includes the primary driven gear '19, a driving gear Blintegral therewith and a secondary driven gear 82 carried by shaft 16and meshing with the just described driving gear 8|. Cam "i5 isdependent for rotation upon tooth clutch 83, a positive saw-toothdriving coupling which is brought into driving engagement under thesupervision of a trip lever initiated by a cam carried upon the upperend of shaft 18, said cam being part of a driven sleeve described ingreater detail in said copending application, and dependcut for rotationupon the friction clutch comprised of the two discs 84 and 85, theassembly of cams 81 being free to rotate upon the release of stop arm86. Shaft 18 rotating at all times under the influence of driving worm35 imparts rotation to its associated apparatus only upon the release offriction clutches 84 and 85 to impart rotation to the cam assembly 81and through the teeth of clutch 88 to impart rotation to theaforedescribed cam 'll.

Though type wheel shifting frame 24 is lifted to variable extents by arm66, spring 64 and bell crank 69 as just described? the degree ofmovement on the part of the lifting levers is always the same. Theextent of rise on the part of type wheel I! is determined by theposition of a pair of stop lugs indicated 89 and 9 I, Figs. 1 and 5 to8, which lugs are capable of being variously arranged so as to engageone or the other of the stop shoulders 59 and GI already described. Itwill be observed that lug BI is the lowermost one and also that it issubstantially wider. than is the upper'lug 89. When both lugs 89 and 9!are in the leftward position as indicated in Figs. 1 and 5, then acondition obtains whereat type wheel II will be permitted to rise onlyto an extent which will align its upper row of characters l2 in printingposition opposite the platen l4 and printing ribbon 2|.

correspondingly, when both lugs 89 and S! are moved into theintermediate position, engagement by shoulder Bl will be had permittingthe type wheel I l to rise until its second row of characters l2 will bebrought into printing position as shown in Fig. 6. When lug 9| is movedto the extreme right so as not to be engageable by either of theshoulders 59 and 51 and when under this condition lug 89 is permitted toassume its lefthand pos tion such as viewed,in Fig. 7, then the typewheel II is permitted to rise until its third row of characters I2 isbrought into printing alignment. Finally when with lug 9| still at theextreme right and the.upp-er lug B8 is brought into the intermediateposition, type wheel I I may be permitted to rise in response to thelifting apparatus until the lower or fourth row of characters 12 isbrought into printing alignment as shown in Fig. 8.

Therewill now be recited a description of the apparatus which, inresponse to line signals, controls the disposition of the lugs 89 and 9|to effect the four designated case shift conditions i which will bereferred to for convenience as the first, second, third, and fourthshift positions in an order corresponding to the aforecited descriptionand also to correspond with Figs. 5, 6, '7, and 8, respectively.

Shift plate 52 is threaded to receive two stud screws 92, the latterbeing preferably of the shoulder screw type with neck portions of sufficient length to be able to receive and support thereat the main bodyportion 93, Figs. 3 and 4 of lug 89. Also threaded into plate 52 are apair Y of'shoulder screws 94 whose necks are 'of' suffiits other endloop secured to the anchor post 99 which extends from a stationary partof the machine, tends to urgelug 9I. and its main body portion 95 towardthe left as viewed in Figs. 1 and to 8.. This influence is overcomeselectively through the instrumentality of' bell crank member IOI-I02.One arm I02 of said bell crank engages the aforedescribed upstanding lug96 of member 95, while its opposite arm is engaged by a lever arm I03under conditions which will, now be described. Bell crank- IOII02 ispivotally supported upon'a shoulder screw 53 which, it will be recalled,is carried by'the shift plate 52 and particularly in a horizontallyextending platform I04 thereof.-

A lever I05 of which arm I03 is'an integral portion constitutes one of asetof six storage members indicated in Figs. 2, 3, and 4. Of the set,however, lever I 05- is the only one having the configurationingiicated, the remaining levers I06 being similar to each other butdiffering in contour as may be noted in Fig. 2. Certain commoncharacteristics of all of the levers I05 and I06 include theiralternatively selectable positions determined by the engagement of theirstop projection I01 with one or the otherof a pair of limit pinsw I08andv I 09, and their latch arm II I through which they may be. retainedin one or the other of their alternative positions by a locking bail H2.Whenlatching-or locking bail H2 is withdrawn, as illustrated in Figs. 2to 4, which is its condition during a brief signal transfer intervaleach lever I05 and I06 is capable of assuming either one or the other ofits alternative positions and, in, response to a received codecombination signal, a corresponding set of conditions is imparted to theset of levers I05 and I06 by means of.a set of positioning swords II3,flat steel members with blunt extremities H4, and universal connectiondiscsIIO. Beyond this point, the selector mechanism generally indicatedH4 is the same in structure and operation as that disclosed in theaforementioned copending application, save that whereas the distributorcam assembly H5 in the instant apparatus is provided with six settingcams. H6, the copending disclosure contemplates but five.

While all of the general class of storage elements I06 are capable ofassuming one or another of the alternative conditions in accordance withthe conventional operation. of printing telegraph apparatus. lever I 95,havin particular significance to the present invention, may also assumea right or a left position in accordance with the setting. it receivesfrom its associated sword H3; The illustrations in Figs. 3 and 4 showlever I05 in the counterclockwise position; that is, with its lug I01abuttingthe right side stop pin I09. The opposite or leftehand positionof member I05 is indicated in Fig. 2. With a given setting orpresentation of. pivot screw 53 .it will be understood that thealternative positions of lever arm I03'may be made to effect alternativepositioning of hell crank IOI and through it,'in turn; to cause to beshifted through upstanding lug 96 the-horizontally shiftable bodyportion-195 of shift controlling lug- 9I.'

Accordingly, with lever 'I 05. in its spacing condition, as illustratedin Figs. 3- and 4, bell crank IOI is maintained mimeclockwise'extremity'witlr arm I02 urging against the.upstanding'lu'gi'ilfi and maintaining body portion so. that lug- 9Iseeks to achieve its right-hand extreme posi-- tion, as illustrated inFigs. 7' and 8. This condition prevails so long as selector I05 is inits spacing condition notwithstanding the twonos-- sible conditions ofshift plate 52. However, when pivot 53 is moved (along with shift plate52) toward the left, Fig. 6, projection 9| may then assume anintermediate disposition as shown.

Lug 89 which-is carried as an integral memberof plate 52 is shiftabletogether with that plate so that it may assume either one of twoalternative conditions as illustrated, for example, in Figs. 5 and'6.-Because, however, elongated slot 55, Fig. l, is of limited extentonlyythe shifting of plate 52 leftwardly as for the purpose of placingprojecting lug 89 to align vertically with shoulder 59 will also modifythe placement of projection 9| through the engagement of the end of slot56 with bolt 94 so that there is obtained ultimately a condition such asthat illustrated in Fig. 6. But, it is to be understood that plate 52may exert an influence on the dispo sition of member 95 only when saidplate 52 is moved to its extreme right-hand position and when, under thecircumstances, member 95 seeks to attain its extreme left-hand position.As a.

result of these efforts, plate 52 will be moved to,

its extreme right-hand position under th influence of selectable element43, but member 95 will be limited in its effort to achieve its left-handposition. because of the restrictive nature of slot 59 which will permitsaid member to move leftwardly only to an extent where its projection 9!will assume the condition indicated in Fig. 6.

Recapitulat ng. selectable elements 43 and 44,. acting through themedium of levers 55 and 48, move 'p1ate'52 and together with it theprojection 89 into either of two alternative conditions, as

exemplified in Figs. 5 and 6, Fig. 7 being, so far as projection 89 isconcerned, similar to Fig. 5.

Selectable element I05 having two alternativeconditions and actingthrough bell crank IOI, spring 91 being a return agency, is enabled tomove member 95 'and' through it projection 9| into either of twoalternative conditions, asexemplified by Fig. '7 or 8 on the one handand Fig. 5 on the other. The intermediate condition of Fig. 6 isattained when plate 52 i in its extreme right-hand position and member95 seeks to achieve its extreme left-hand position. As a result, member95 is intercepted in its path of progress because of the restriction byelongated slot 56 and is permitted to move only to an intermediateposition, as illustrated in Fig. 6.

It is therefore to be understood that a total of four case shiftselections may be achieved in re-. sponse to (1.) the two standard orprimary case shift signals conventionally used for elevating. a

type wheel in the manner described in the co-' pending applicationreferred to above, and (2) an additional or' secondarycase shift inresponse to the sixth codeimpulse which effects corre-.

s aonding positionment of the storage element First modification of afive-unit line signal code instead of a sixunit code, the secondaryshift signal characteristic being inherent in the nature of the polarityof marking impulses instead of the marking or spacing nature of thesixth pulse. It is pro-posed, accordingly, to make available for signaltransmission both positive and negative current potential, either one ofwhich is to be used permutatively with no-current to produce five-unitBaudot permutation code signals, but whether the marking signals areconstituted of positive current or of negative current will determinethe alternative characteristic of the secondary shift control.

In the diagrammatic representation, Fig. 9,

the reference character I2I denotes a transmitting distributor of therotary type which may be controlled by start-stop or multiplex(synchronous) supervision. A tape sensing unit generally indicated I22,is provided with six tape hole feelers. Five of them are committed tothe fiveunit signal code, and their contactors I24 are thereforeassociated with the five segments of the transmitting distributor I2I,but a sixth one whose contactor is indicated I23, is designed to sensethe presence or absence of a sixth perforation in a six-hole tape, andserves to introduce positive or negative current to the contact segmentI34 which, in turn, introduces corresponding current condition to themarking signals, as will now be described.

The tape transmitting apparatus I22 may be of any conventional type, oneembodiment being illustrated in U. S. Patent No. 1,661,012, except thatinstead of providing but five sensing levers and associated electricalcontacting apparatus, unit I22 may correspond in all respects thereto sofar as the conventional feeler levers I24 are concerned, special feelerI23 being simply an additional member and having an additional pair ofcontacts with separate contacting points represented by the rectanglesI25 and I26. The cable I28 contains five lines, each connecting one ofthe feeler lever contactors I24 with its associated segment indistributor ring I29. A conductor I3I connects special feeler contactorI23 with one terminal of the winding of a polar relay I32; Continuingfrom the other terminal of polar relay I32 is a conductor I33 leading toa special segment I34 of a distributor ring I35 adapted to be bridged bya pair of brushes grounded ring I31.

It is to be noted that the aforementioned segment I34 aligns with andcorresponds to the distributor cyclic period coincident with theconventional start segment I38 of distributor rin I29 and that thiscyclic interval is in advance of the first one of the five permutationcode segments of ring I29. For this reason, it will be observed, theoperation of relay I32 will occur in advance of the time that brushesI39 encounter said permutation code segments of ring I29. Thus, thetransfer operation on the part of relay I32 is made to occur during ano-current interval of the line conductor I48 (segment I38 having noconnection with any of ,the feelers) and there is in this way preventedthe possibility of foreshortened or clipped impulses, a result whichmight not be avoided save through the utilization of a neutral intervalduring which to exer- I36 with the .-cise the current reversal.

The normal position of tape feelers and their associated contacts I23and I24 may be disposed in the manner illustrated in Fig. 9; that is,with their contacts engaging terminal blocks I25 and 'spective segmentsof ring HI. Accordingly, when presented against the surface of the tape,said contacts I23 and I24 seek to engage the contact blocks I26 and I21,those encountering perforations being permitted to do so and accordinglyconnecting their re- I29 with block I21 which, in turn, receives currentpotential over a conductor I42, contactor I43 from one or the other of apair of opposite current sources I44 and I45. Those not encounteringsuch perforations, how ever, will, during the critical portion of thesignal transfer, fail to obtain current and hence cause to beconditioned their respective segments of ring I29 without electricalpotential or with no-current.

Relay I32 being of the polar type as already mentioned, its armatureI43wi1l move to the right or to the left engaging the contact points I48or I41 in accordance with the nature of cur rent coming overconductorI3I from contactor I23 which may engage positive current block I26 ornegative current block I25. When placed in either of its positions,armature I43 remains until altered by an opposite polarity introducedinto the windings of its relays I32. Accordingly, it will be understoodthat the presence or absence of a sixth perforation will correspondinglyimpress block I21 with positive or negative current and that on thisaccount, permutation code signais generated over the segments of ringI29 may be either positive and no-current or negative and no-current andthat they will accordingly be issued out over line conductor I48.

At the receiving station, there is connected to line conductor I48, inseries, the selector magnet I49 and a receiving polar relay I5I whosearmature I52 will engage or withdraw from its contact point I53,depending upon whether the marking impulses of the received signals areof positive or negative polarity..- In accordance with the move ments ofarmature I52, operating current will be introduced to or withheld fromthe winding of a secondary shift control magnet I54, over an obviouscircuit, Fig. 9.

A bell crank armature I55 pivoted at I56 and responsive to theenergization or nonenergization of magnet I54 actuates an intermediatebell crank lever I51, resembling in'appearance and operation the bellcrank lever IBI discussed in the preferred embodiment above. The actualrelationship and position of hell crank lever I51 is as illustrated inFig. 10, whereat its vertically extending arm engages a projection I58integral with the horizontally shiftable bar I59 whose interponent lugI6I corresponds in appearance and operation to the lug 9| of thepreferred embodiment.

Bar I59 will be supported in the same manner as bar of the preferredform; that is, by a shiftable plate, such as plate 52, and will becapable of responding in the same manner as the other member. Likewise,a lug I62 corresponding to the described. lug 89 will be provided andwill also be carried by said shiftable plate, the two lugs I6I and I52to function under the control of bell crank I51 in a manner and for thepurpose already described in the preferred embodiment.

Since the operation of secondary shift control magnet I54 by the currentcharacteristics as aforedescribed need not be established except duringany one impulse of a signal, and since the most favorable opportunityfor executing the performance (energization or release) of said magnetI54 is coincident with the stop (R). impulse interval, means have beenprovided for shunting the supervisory polar relay II 15.0 i-thateit maynot fluctuate except :duringthe precise interval coincident with .thestop signal impulse. This supervision is exercised by .a special camcarrie'd upon .the distributor shaft I50 which, acting through afollower lever, causes the contact pair I50 .to come ajar duringthedistributive interval coincident with the stop impulse, therebyremoving the shunt ground from a local circuit as shown in .Fig. v9cutting into circuit relay .I'5I together with magnet I49 and.permitting both members to respond to the stopimpulse. .Atsall othertimesin the distributive :cycle, however, the apex of said cam of thedistributor shaft I60 is withdrawn from the follower lever permittingcontact pair I50 toengage and to therebyeffectively shunt relay I5Ioutof the signalresponsive circuit. I

It is to be understood, therefore, that the modified showing of Figs.9-and l0,illustratesanother manner of controlling the functioningofasecondary shift control structure but, in this :case, under thesupervisionof a five-unitcode instead of a six-unit code as contemplatedin thefirst described system. A shift characteristic for the purpose ofsupervising a-secondary type wheel shift function hasbeen-embodied intothe standard five-unit code by alternating the current characteristic ofthe market impulses between plus and minus, the spacin'g-impulsesbeing:in all cases nocurrent.

Second modification In Figs. 1-1 and 12, there is illustrated a furthersystem of printer controland line transmission for utilizing thefive-unit-Baudot code signal in such a manner that it willafiordsix-unit signaling possibilities. Other manners of accomplishingthis result have already been disclosed in connection with theembodiments described above, as by providing-means for supplying twocurrentconditions-for the marking impulses.

In the manner of signaling contemplated in connection with thepresent-embodiment, there is employed a five-unit "Baudot typecodecombination signal having, in addition to the conventional fiveselective impulses, 'a special impulse utilized for supervisingsecondary shift control and astart impulse interval of a polarityopposite to that of;-its preceding or-special impulse interval, underthe specific contemplation of the five code-combinationimpulse interval.

In other Words, whereas conventional fiveunit permutation code signalsbeing provided with seven componential impulse intervals contemplatestart and'stop impulses of predetermined and invariable linecharacteristics, -means are herewith provided for varying thecharacteristic of the stop signal interval so that in accordance withits electrical nature it may have utility for determining case selectionas well asfor phasing supervision by maklngthestart initiating apparatusresponsive to a startlimpulsecone dition of electrical polarity oppositeto thatof the immediately preceding stop impulse interval which, as hasbeen said, may consist of either one of two alternative line conditions.

In the incorporation of this plan of operation,

I it has been found expedient .to utilizeplusand minus currentconditions to represent marking and spacing instead of the conventionalpractice of utilizing current and fno-current-conditions for thispurpose. Moreover, as in :thecase ofthe first modification, Figs. 9 and.10,v there will .be utilized for the purpose of .signalitranslation a.

i e er sensing apparatus generally indicat d by titre referencecharacter I '1. I qReader mechanlsm I 11 .-.is1illustr,ated as havingseven contactors I12 to 11.8; however, contacts I11 and I18 both arecarried upon a singlefeeler lever while each of the remaining contactors112 to I1B, inclusive, is-carried individually upon alfeeler lever.

Inaccordance with theoperation of its feeler lever, each contactor isspring urged so that .it will engage the contactiblock towards. theright and is capable of movement in anoppositedirection so as to engagethe contact block towards the left, ,as illustrated in Fig. 12. Thecontact .block at the right is comprised of a large section indicatedI19 and a smaller section insulated therefrom indicated I8I. The contactblock at the left is similarly comprised of. two sections, the largerone indicated I82 and'thesmaller one I83, -More'ovenas may be noted the.small con tact block I83 is connected electrically over an obviousconductor with the large contact block I19 and correspondingly smallcontact .block I8I is connected electrically with the large contactblock I82. Opposite sourcesof grounded poten tial indicated I84 and I95are connected respectively t0 the contact blocks 159 .and .I8I overconductors I86 and 191 to :the oppositely placed contact points ofarmature I88under the control of a polar relay I89.

The winding of said relay I89 is connected at one end to theaforedescribed :feeler contactor I18 andat its other end toa distributorsegment I9I situated in distributor -ringxl92. This distributor I96whichincludes-also distributor rings I93, I94, and 2I95isof thestart-stop type having a brush carrier 1.91 which supports two pairs ofbridging wipers I98 and I99. Brush carrier I91 of transmittingdistributori96 is conventionally illustrated in'Fig. 12, but itis to beunderstood that this elementis :driven through a friction couplingpreferably in'a rotary direction and that it may be restrained :frommovement by the intervention iof'an armatureiZUI 'under thesupervision'of start magnet 202. .Also, that the pa'ir of wipers I98serve to connect segmented distributor ring I93 with the soliddistributor ring I94 which is electrically connected to line conductor283, andthatithepalrof Wipers I99 correspondingly connect distributorring I92 which contains thesegment I9I aforedescribed with the groundedldiStIibllliOI ring I95.

Attention will now be given to distributor ringI93.:which,.as.may.beobservedin Fig. 12, is made up .of seven segments.When the brush carrier I96 is'in its arrested position, wiper I98iscontacting the slightly longer segment designated- 5 in thedistributor ring I93. Also, it maybe ob served that following thesegment 5whi'ch serves also in the capacity ofla stop segment --as willlater be described, .there :is encountered a start segment designatedbythe characters. 1

Following this segment is one designated 0 (zero), which has beenarbitrarily assigned to the function ofsupervising .the secondary shift.This control'isotherwise executed, inaccordance with the presentembodiment, .ina manner generallysimilar to ithat described above inconnection with the preferredembodiment.

The remaining segments I, 2, 3, etc., including connected overa-iconductor- 204' to the feeler 11-1.-

Se ment .5 ;1's connected over a conductor .205 to the armature I88 ofpolar relay I89. Fig. 12 illustrates diagrammatically transmittingstation equipment including a perforated tape controlled mechanism and arotary signal transmitter under the supervision thereof for issuingsignals of a type adapted to exercise the control function includingprimary and secondary shift supervision for printing apparatus havingmechanically the characteristics exemplified in the showing of Fig. 11.

As the brush carrier I91 proceeds in the downward direction as indicatedby the arrow 280, the pair of wipers I98 leave segment No. and encountersegment S bridging this element of distributor ring I93 with the solidline ring I94. Assuming, for the sake of illustration, that the"perforated tape signal which has just been positioned and which hasbeen impressed upon the feeler levers of record reader MI is such thatcontactors I11 and I18 (which operate in unison) are moved to the"right, that is to say, with contactor I11. engaging block I19 andcontactor I18 engaging block I8I, distributor segment No. 5 will havereceived positive current potential from grounded battery I84 overconductor 204. This circuit is traceable from positive battery I84,segment I83 to segment I19, feeler I11, conductor 204, segment No. 5 ofdistributor ring I93, brushes I98 to outgoing line ring. I94 which isgrounded at the receiving station. As the brushes proceed to the nextsegment which is designated S, opposite polarity is issued from groundedbattery I85 if polar rela I89, in accordance with its precedingoperation, has been left in a position whereat its armature I88 engagedthe contactor of conductor I81. This circuit is traceable from negativebattery I85, conductor I81, armature I88, conductor 205, segment S ofdistributor ring I93, brushes I98 to line ring I94.

If instead of the supposed example described above, the particularsignal had been one in which the feelerlever with which contactors I1!and I18 are integrally associated was positioned to the left causingengagement with contact blocks I82 and I83 instead of contact blocks I19and I8I, the electrical characteristics relative to segments 5 and Swould be opposite to that just described. With the brushes I98 passingover segment 5 negative potential would be supplied from groundedbattery I85, segment I8I, segment I82, feeler I11, over conductor 284 tosegment No. 5. Likewise, positive current would be supplied fromgrounded battery I84, conductor I86, armature I88 of polar relay I89,which has been energized to its opposite position, conductor 205 tosegment S of distributor ring I93. Each of the feeler contactors I12 toX16, inclusive, is connected over an individual conductor with anassociated segment 0 (zero) to 4 of the transmitting distributor ringI93. Accordingly, when a feelerlever encounters a perforated position inthe tape, its contactor will be moved into one position, say theright-hand one, engaging the contact block I19 while its said feelerlever encounters a, nonperforated position and its contactor will assumean opposite condition; that is, contacting the opposite block I82. Thedesignation of plus or minus signals to correspond with perforated ornonperforated signal components is arbitrary, and it is to be understoodthat the reserve association is equally feasible.

The foregoing is true not only of the conventional five feeler levers ofcontactors I12 to I16, but also of the special feeler lever with whichare associated two contactors. I11 and I18, as has already beenmentioned. One significant difference, however, does prevail which willnow be noted. In the case of the special or sixth feeler lever, when aperforation is encountered and, say both contactors are moved to theright, contactor I18 will be introducing negative current from batterysource I to the winding of bias polar relay I89 while contactor I11 willbe introducing positive battery from source I84 over conductor 204 tothe stop segment 5. Conversely, with the contactors I11 and I18 in theopposite position, that is, engaging contact blocks I82 and I83,positive current originating from source I84 will be introduced throughfeeler I18 to the winding of bias polar relay I89, while negativecurrent originating from source I85 Will be introduced over conductor204 to stop segment 5. Accordingly, since armature I88 of relay I89 isconnected to the start segment S, the result of the operation of thesixth or special feeler lever will be understood as one controlling thereversal of potential for start segment S, that is to say, with a givencondition on the part of segment 5 which may be either plus or minus thesixth feeler lever controlling contactors I11 and I18 operate to providean opposite current potential to the start segment S.

The purpose in having provided polar relay I89 with its armature I88connecting plus or minus current to the segment S instead of directlyconnecting the contactor I18 to said segment S is one of permitting thestart impulse signal interval to be stored. The transmitter utilized isof the well-known magnet type wherein a new signal is sensed during thestart interval. If a new signal should be sensed which would cause thefeelers I11 and I18 to move to their opposite position the start impulsewould be of the same.

polarity as the stop impulse. However, by provicling the polar relayI89, the armature I88 will be held in a position whereby potentialopposite to that of the stop segment 5 will be assured, as the armatureI88 retains such position until the brushes I98 have passed the startsegment S, or until brushes I98 sweep across segment I9I of ring I92,thus providing a grounded circuit for the polar relay I89. At this timethe armature I88 may move to the opposite side if the feelers I11 and H8have moved, but the start impulse has already been transmitted. 1

In Fig. 12, the reference character 205 designates a receiving stationand within said outline are contained the symbols representing vitalapparatus responsive to the signals generated by the transmittingdistributor I96. Of these, the reference character 201 denotes a biaspolar relay whose armature 208 is grounded, and is adapted toreciprocate between two contact points 209 and El I which are part of alocal circuit for supervising the operation of principal control magnets2I2, see also Fig. 11.

which is one of an assembly carried upon the dis tributor cam shaft 18,see also Fig. 1. Also carried on shaft 18 as an integral part of theaforedition' to thecams already-designated in the assembly .carried byshaft 18 is one indicated' 226,

having :a plurality of :spacedapice's, which when said cam assembly isrotating, serve torock the armature bell crank '22-! about its pivot 223for the purpose of presenting-its magnetically attractive arm 229againstthe polar face of magnet 212. This operation 1 of cam 225 massisting the armature 227 and thereby diminishingthe work of magnet 212is inaccordance with recognized practice in printing telegraphy. 1

As illustrated in Fig. 11, storage lever 1 115 is disposed below theother storage levers '-2-31 and 232. This arrangement is in a generalsense arbitrary for the shift signal impulse, in the particular instancecorresponding to 'thesegment on the distributorring 193, Fig. 12,maybe'located if preferred in-any other-position withrespect to thecomponential sequence both in the-distributor ring 193 aswell as'in thestacker-"selector storage 1evers,-Fig. 11, designated 105, 23.1, and232. Storage levers' 23'2 are five in number corresponding to the signalcomponents which utilize the segments -1, 2, 3, 4, and 5 in thetransmitt'mg distributor ring 193. Storage lever 231, together with thetop "one of levers 232, correspond to the code signal'impulse occupiedbythe segment 5, and in the'order designated :each impulse ultimatelyserves to place'its associated lever .231 or 232 in one-or anotherof itstwo possible positions as already described .inconnection with thepreferred'embodim'ent.

For the purpose of understaridingthe principles of the instantimprovement, it will sufiice to state that ultimately the storage signal'is'rn'an'ifest by a conditioning of the several "storage levers 105,231, and 232 with thelever I05 exercising the function of controllingsecondary case shift bell crank llll andlevers232ifunctioning tocondition the set of code discs 234 which are five in number.

Storage'lever 231 controls'the shifting of abovementioned contactor 213.-Accordingly, when it is,.found inthe position as illustrated in Fig.11, it .permitsvcontactor 213 to engage its upper contact 21.9, and whenit is'in an opposite condition such as that occupied .by.thecounterclockwise extreme storage lever 2'32, in Fig. '11, said lever231 by its protuberance 235 will engage the insulated extremely ofcontactor 213 and thrust the latter member. so that .it will disengagecontact 219 and engage contact 218 instead.

A supervision of contactor 214 is .had byfollower lever arm 221 underthec-control of cam apex 223, that is, when apex223 is in the positionindicated, contactor 214 is thrust against-its 1 left contact 215 butat' all other times; thatis,

when-apex 223 is clear ofthefollower arm 22 1, contactor 214 ispermittedthrough its own sprin tension to recede from-contact point 2=15 and toen age instead .contactpoint 211i. llhere will new bejdescribeditheefiect. of the supervision iii oontactors 213 1and 2'14 by v theabove-described apparatus.

:Let it be assumed for. the sake of illustration that' aiparticularcode'signal transmitted 'over distributor 196 .is comprised'ofa certaincombination of code-impulses Whose fifth component (there being a totalof six components including 0) is-constituted of markingcharacteristics-that is, the current characteristic which will position,its sword 233 in the manner-opposite to that indicated in Fig. 11 so asto place storage'lever 231 in the positionopposite to that indicatedinthis illustration. Accordingly, contactor 213 will be permitted torecede from contact point 213"(assuming that a preceding signal'difieredin-respect to this signal component) and: to. engage instead its-contact218. Thiswill correspond also "toithe placement of contactor 214,asillustratedin 'Fig. 12. In order to produce this result, the nature ofthe signal impulse will-be such. as toefiect 'the polar relay 201 tocause it to move its, armature 2113 to engage contact point 211soastogcloselthe circuit for selectormagnet 212 and .to cause the armaturelever 236, Fig. l1, to assume is marking position. Subsequently, therewill follow the start signal impulse whose effect uponrelay 201 will.be-opposite tothat just-described in connection with the No. 5 signalimpulse, which reversal is assured by the apparatus of the transmittingdistributor described-above. In consequence,relay armature 208 willbemoved:counterclockwis to engage itscontact point 209, as 'illustratedi n Fig. l2'opening thecircuitior energizingselector magnet 212 andthereby releasing the-selector apparatus 'for a given cycle.

Under the alternative conditionof operation, that is, with the No. 5'impulse being of spacing nature, contactor 2I3 Will be withdrawn fromcontact point 218 and'thrust into engagement with'contact point 219.instead. As describeddn said copending application; referred to above,cam shaftw18 carries in' addition to :the aforedescribed operating cams223 and 226, a spiral distribution of cam apices indicated 230, fiveinnumber. Each one-of these is "related toone of the signal impulses '1 to"5, inclusive, whose corresponding segments "appear inthe distributorring 193, Fig. 12, while the final one-ofsaid series speciallydesignated230A, Fig. 11, is in accordance with the present embodiment, of'doublewidth.

This'is'so because'unlike the otherof the-cams 2311 which serveto-actuate but a single one of the claw levers 224, it alone-actuates 'apair of said claw levers 224. Since said levers "224-.are all of thesame contour, they 'maynot be dife ferentiated in the showing of Fig.11,, however, on account of the spiral arrangement of said cams'230,each claw lever'224 will. be operated at a particular cyclic interval,except saidtwo claw -levers224 which are operated in unison by 'thelocking projection by being placed on one side or the other of a lockingbail 241, which member assumes the position indicated in Fig. 11,exceptduring a brief interval following the conclusion of a particular signalwhen its lever arm 242 is released by the operation of theaforedescribed auxiliary shaft '16.

Accordingly, while the several swords 233 and 233' may assume oneposition or the other as its abutment 242 or 244 encounters thedownwardly extending vane 245 or 246 of armature 236, levers 231 and232may not be correspondingly positioned until said swords 233 and 233'are thrust downwardly by the clockwise movement of the claw levers 224,which movement is urged by their individual springs 241 as well as byauxiliary individual springs carried upon an integral extension of leverarm 242.

The auxiliary springs of lever arm 242 are not shown in Fig. 11 of theaccompanying drawings, but reference may be had to the aforedescribedcopending application where it is explained that their function is of anauxiliary nature and to assist the principal actuating springs 241. Noneof the springs 241 or the auxiliar springs mentioned may actuate theirassociated clawlevers 224 during the time that the locking bail 241intervenes by blocking the extending portions 239 of levers 232.However, since lever 231 is not provided with an extension 239 as arethe remaining ones of the levers designated 232, its response to itsassociated sword 233 will occur immediately following the instant whencam apex 230A passes the follower projection of claw lever 224 whichcarries said sword 233'.

Thus, while the consummation of a signal transfer relating toaparticular set of code impulses of any signal must await a briefinterval following the fifth or stop code impulse, the actuation ofcontactor 213 by the projection 235 of*specia1 storage lever 231 followsimmediately upon receipt of the fifth code impulse. This assures theoperation of selector magnet 212 for the purpose of arresting therotation of shaft 18 coincidentally with the signal intervalcorresponding to the stop or fifth code combination impulse, even thoughthe other purposeof the particular impulse, namely, that of setting oneof the code discs 234, may await its regular period of operation which,as has been said, occurs after the lapse of a brief time interval and,in fact, during the occurrence of a succeeding code combination signal.

Cam apex 223 is specially provided for the purpose of actuating theaforedescribed arm 221 which, in turn, controls contactor 2 I 4. Camapex 223 is effective to thrust contactor 214 against its contact point215 for a period commensurate approximately with the beginning of thestop or No. 5 code combination impulse and continuing "through the startimpulses and to then (zero) or shift controlling impulse. At other timescontactor 214, see also Fig. 12, engages its contact point 216 for apurpose which will now be described.

Operation of the second modification Concisely stated, armature 208 ofrelay 20'1 fluctuates in accordance with each signal impulse, contactor214 being controlled by cam apex 223 rests against contact point 216 atall times except during the stop and start signal interval, andcontactor 213 being controlled by the No. 5 or stop signal is moved intoone or the other of two alternative positions as-a result of theoperation of the transfer mechanism, describectabove, only during theperiod corresponding to this impulse. Under an assumed set ofconditions, in response to marking signals, both armature 200 andcontactor 213 will be deflected downwardly, that is, to engage theircontact points 211 and 218, while under spacing signal impulses, saidarmature and contactor will be in their opposite position, that is,engaging respectively their contact points 2119 and 219. Also, it is tobe recalled that since the No. 5 impulse functions in a dual capacity ofeffecting the distributor stop control as well as of entering into'thepermutation code,

each cycle must be considered as including a part of the preceding No. 5impulse, which affects the current characteristic of the start impulseas well as of the concluding No. 5 impulse, because it, together withthe impulses 'Nos. I, 2, 3, and 4, comprisesthe code combination of theparticular signal.

Accordingly, when the No. 5 impulse of a preceding signal happens to bemarking, armature 208 will be thrust into engagement with its contactpoint 211, contactor 214 will be thrust into engagement with its contactpoint 215 (on account of the operation of cam 223) and contactor 213, asa result of the transfer operation, will be moved into engagement withits contact point 218. This will complete a circuit traceable from 213with which it is then in engagement, conductor 253, contact point 211,and its armature 200 which is then in engagement with it to ground. As aresult of the continued energization of magnet 212, its armature is heldand the rotation of shaft '18 is arrested in accordance with theconventional operation of printing telegraph selector shafts. Thiscondition continues until the circuit for energizing 212 is broken,which change occurs upon the rece-iptof a proper start impulse oversegment S of transmitting distributor ring 193. The polarity of thestart signal being opposite to that of the No 5 or stop signal impulse,as already explained, causes armature 208 to be moved to engage itscontact point 209'and away from its contact point 211. This interruptsor opens the circuit for magnet 212, causing the release of its armature236 and consequently initiating the rotation of receiving distributorshaft '18 in a manner clearly described in the copending applicationreferred to.

As distributor shaft '18 rotates, cam apex 223 rides off the projectionof arm 221 permitting contactor 214 to be drawn away from its contactpoint 215 and to come into engagement instead with its contact point216, meanwhile contactor 213 remaining in engagement,with its contactpoint 218 because it can be changed only during the occurrence of thefifth impulse, As a result of the change incontactor 214 from contactpoint 215 to contact point 215, no effect is obtained at this time,magnet 212 continuing to be deenergized until during the course of thesucceeding six signal impulses, 0, 1', 2, 3, etc., armature 208 inresponse to its relay 20! returns to engage its contact point 211, whichresponse can occur only under the control of marking signal impulses.

In the event that a marking impulse is received during the 0 (zero)impulse interval, the action of one of the swords 223 upon the storagelever will cause bell crank 101 to be rotated clockwise in a manner andfor the purpose already ture, the succeedingoperation will be the sameas-the one just described except for the variations which may occur inthe code combination, but if instead the signal impu sercorrespond'ingtothe No. interval happens to be ofspacingrnature, then armature 208 will,respond by engaging its upper contactpoint 209 and sword v233' willbedisposed in the manner illustrated in Fig, 11. As a result of the latterincident, cont actor 2l3 will be permitted toengageit upper contactpoint 2I 9 instead of the lower contact point 2|8, while on account ofcam apex 223, contactor 2 will again be thrust against, contact point215. Thus, a circuit will be completed for energizing the magnet 2I2traceable from grounded battery through the winding of magnet, 212,conductor 252, contactor 2l3 which is then in engagement with itscontact point 2l9, conductor .254, contactor 2| 4 and its contact point2| 5, conductor 255, contact point 209 and its contactor 208 which isthen in engagement with it, to ground.

As a result, magnet 2 I2 is held energized which is the proper conditioncorrespondingto astop impulse until an opposite current condition isreceived 'by relay 20'! causing its armature 2018 to be withdrawn fromcontact point 209 and to engage instead contact point. 21],. When thisoccurs, contactor 2l4isisti1l held engagement with its contactpoint'zllibecause ofthe described function of cam 223, which maintainssaid condition until after the interval corresponding to the start, S,impulse. Meanwhile-the last described movement of armature 208 causesthe energizing circuit for magnet 2lfl2'to be broken and accordinglyreleasing its armature 236'for the purpose of initiating rotation ofreceiving dis tributor shaft I8, as aforedescribed.

Thereafter and coincident with the ll-(zero) signal interval, apex ofcam 223' restores 'contactor 2| 4 to its condition'prvalent during-themajor portion of the cycle; that 'is,; engaging'its contact point 2I6.When this 'occursythat' is,

when armature 208- of relay 201 engage contact point 2, markingimpulscs'arethereafter'interpreted as magnet 2I2 energizing'impulsesbecause contactor 2 l3'continues in-engagement-with its contact point2l9, causing the magnet '2I2 energizing circuit tobe completed over thefollowing described course. The current originates with grounded battery25I through the winding of magnet 2l2-, conductor 252,-contactor'2l3,'and its-contact point "2I9,- conductor -254,-contaetor '2 I4 andits contact point-2N, conductor-253-, contact 2H and its contactor 208,to groundp Thus, phasing of the receiving magnet 212 as well as of itscontrolled shaft 18 isregulated notwithstanding the reversedcondition-of the No. 5-and star-t impulses. I

While the foregoing description-has been explained and described withreferenceto specific embodiments, it is not intended-tube restricted inany manner-torthe language :onthe detailed specification norto.theillustrationsiinitheaccom Rall ing. drawin s;- except a indicatedin .the hereunto appende'd claims; 4

What is claimed is:v

L In a,- telegraph transmission system,; a transmitting stationapparatus comprising va transmit. tingdistributor having .a series ofcode signal impulse segments and a special segment, a tape sensingapparatus having a set of alternatively conditionable perforationfeelers each one-associated with one of said transmitter segments, meansunder the control 'of each of said set of feelers for conditioning itsassociated transmitter'segment in a manner corresponding to itscondition, and means ior vconditioning said spe-. cial transmittersegment in a manner reverse to that of one of saidcode segments.2.-In-a-.tape transmitter, a transmittingsdis tributor havinga series.of impulse elements, ,a tape feeler unit having series of-tape feelerlevers,.,meansunder the control of certain ones ofixsaid tape,feelerlevers ,for correspondingly conditioningcertainassociated ones ofsaid transmitter elements-,; and ,means responsive to :the

operation of a certain; other on or said feeler' levers forsimultaneously. conditioning aplurality of said transmitting elements.ina variable manner.

3. Ina telegraph system, ,the method of -sig naling which comprisesgenerating sets of variable signal. impulses each having, alternativeelec trical conditions, allocating all but one of said signal impulsesto a permutation code, allocatingsaid one of said signal impulses to thefunction of initiatinga signal distribution release op,- eration, anddetermining. the electricalflcharacteristic .of' said oneimpulse to beinvariably- 0pposite to. that. of .a certain impulse of its set.

4. c In a telegraph transmissionv system, a transmit't'ing stationapparatus comprising a transmitting distributor having a series of codesignal impulse segments and a special segment; a tape,

cial transmitter segment in accordance with a predeterminedcontrast." V5. In a tape transmitter, a transmitting ,distributor having a series oftransmitter elements, a 'tape feeler unit having, atseries of tapefeelerlevers, means under the -control of certain ones of said tapefeelerlevels for correspondingly-conditioning certain associated ones of" saidtransmitter'elements; and means; responsive to the operation of acertain' otherone of said feeler leversfor simultaneously--conditioning; two; of said transmitter elements oppositely,- 6. Inatransmission system,- a rotary distributor for issuing permutation codesignals includ, in'g a sequence 0fcode impulse 'segmen-ts and phaseregulating-segments,sand means under the control :of the last codeimpulse segment :of. .the sequence for determining; the electricalnature-of anensuing phasesregulatinggsegment;

7. In a transmission system according toclaim 6, a tape sensingapparatuscomprising feeler levers positionable according to perforations in acontrol:.,form, ccntactorsz-ipositionable "according td;,-saidfeelers;and peach;-v electrically associated ith n of: said distributorsegments; and are.- 1ay-,;under; .the contro or the; last; vcodeyimpulse se ment oft-said; senesccmprisin :sa dme nsifor eterminintheselec ri alz na ure Qf.. ensuins nhaseizesulatinsasesment v v 8. In atransmission system, a set of feelers for sensing codal perforations ofa control form, a feeler for sensing a shift perforation in a' controlform, a contactor associated with each of said feelers and movabletherewith to engage predeterminedly related current potentials, afurther contactor mechanically associated with one of said codalperforation feelers to move to engage said current potentials in anopposite manner, and a distributor including a set of elements eachelectrically connected to one of said feeler contactors and said furthercontactor for generating signals constituted of impulses of currentpotential according to said engagements of said contactors.

9. In a transmission system, a rotary distributor comprising a series ofsegments, some relating to cyclic phase regulation, some to essentialsignaling code, and some to case shift controlf a record readerincluding a series of contactors each connected electrically to one ofsaid distributor elements, two sources of electrical signaling currentdisposed to be engaged by the contactors of said essential code and saidcase shift control elements under similar conditions of operation andsaid phase regulating contactor under opposite conditions of operation,and means for compelling the contactor of said phase regulating elementto perform in a predetermined relation to the operation of one of saidessential code contactors.

LOUIS M. POT'IS.

